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參數(shù)資料
| 型號： | TB62732FUG |
| 廠商： | Toshiba Corporation |
| 元件分類： | LED驅(qū)動器 |
| 英文描述： | Step-up DC/DC Converter for White LED Driver |
| 中文描述： | 升壓直流/直流轉(zhuǎn)換器白光LED驅(qū)動器 |
| 文件頁數(shù)： | 6/18頁 |
| 文件大?。?/td> | 294K |
| 代理商： | TB62732FUG |
TB62732FUG
2006-06-14
6
State of Peak Current Control
“Peak current control” is control that can vary the peak current pulse shown in Figure 2 on the previous page.
The current pulse in Figure 2 is a charging current on the output side capacitor C
2
. This is supplied to the LED
as a C2 discharge current and flows through the R_sens resistor to GND.
The charging voltage wave form of C
2
is fed back to the IC from pin K.
In the internal circuit to which it is assumed pin K is input, the mean value of the AC voltage waveform
obtained decreases the peak current to an assumed value of approximately 48 to 54 mV.
As a result, a constant current is controlled as an average current in the LED.
Therefore, if R_sens
=
2.7
is connected, an I
F
current of 19.6 mA can be obtained.
The TB62732FUG is designed to be able to supply a load power of 320 mW (min.). With an inductance of 4.7
to 10
μ
H, the boost inductor has been optimally designed for this load power of 320 mW.
Also, make the inductance small when the load power is low.
A condition applying to the LED load between pins A and K is that
V
IN
(V
CC
) < LED V
F
total
should be strictly maintained.
The LED will be illuminated always regardless of the IC control. Care should be taken in this regard.
t 200 ns/DIV
Standby Operation
The SHDN pin is used to set normal or standby
operation. When SHDN is set to Low, operation is in
standby; when the pin is High, the LED is turned on.
Current consumption in Standby Mode is 1
μ
A (max).
Drive Waveform
The figure on the left is an actual drive waveform.
From the top, the switching voltage waveform of
the coil of the generator terminal (pin A), the
feedback voltage wave form of pin K, and the LED
I
F
.
Figure 3 Burst Control Waveforms
Switching frequency
f
OSC
=
1.1 MHz
As I
A
(peak) is lowered, it is stabilized at the set value
I
o
..
LED V
F
I
A
(peak)
Pin A current (external
inductance current)
Pin K voltage (current
charged on capacitor)
As I
A
(peak) is lowered, it is stabilized at the set value
I
o
.
Maximum On pulse
width
=
85%
Pin A voltage
Pin A
voltage
5 V/DIV
Pin K
tvoltage
0.5 V/DIV
IF current
20 mA/DIV
C2 = 0.1
μ
F
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TB62733FTG | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:Charge Pump type DC/DC Converter for White LED Driver |
| TB62734FMG | 制造商:MARKTECH 制造商全稱:Marktech Corporate 功能描述:Step Up Type DC-DC Converter for White LED |
| TB62736FUG | 制造商:MARKTECH 制造商全稱:Marktech Corporate 功能描述:Step-up Type DC-DC Converter for White LEDs |
| TB62736FUG(O,EL) | 功能描述:LED照明驅(qū)動器 White LED Driver RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| TB62737FPG(O,EL) | 功能描述:LED照明驅(qū)動器 White LED Driver RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
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